extract shape in _view_has_unbacked_input (#160255)

laithsakka · facebook-github-bot · commit d801f17329d8 · 2025-08-09T12:29:15.000-07:00
Summary:

We were getting DDE on reshape still!! i looked deeper and found an issue in _view_has_unbacked_input namely when input is [[,,]] it need to be normalized to [..]

Test Plan:
existing tests.

Rollback Plan:

Differential Revision: D79951119
diff --git a/torch/_subclasses/fake_impls.py b/torch/_subclasses/fake_impls.py
@@ -514,6 +514,8 @@ def maybe_guard_or_true(x):
 def _view_has_unbacked_input(a, shape):
     from torch.fx.experimental.symbolic_shapes import has_hint
 
+    shape = utils.extract_shape_from_varargs(shape, validate=False)
+
     return (
         any(not has_hint(s) for s in a.size())
         or any(not has_hint(s) for s in a.stride())
